The most thrilling roller coasters usually contain vertical loops. What keeps the riders in their seats when they go upside-down?

Groups of organs that work together to complete a process in the body are called: a. cells b. tissues c. nerves d. systems

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation